Lamp



FIG. 1 is a perspective view showing my design;

FIG. 2 is an elevational view thereof;

FIG. 3 is an elevational view thereof as seen from the right of FIG. 2;

FIG. 4 is an elevational view thereof as seen from the left of FIG. 2; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a lamp, as shown and described. 